I believe that kiss a girl’s neck is not a sin per se, but it has many sexual connotations. We usually kiss a girl’s neck when we have not another thing to kiss (that cans be discovered). Something like a neck is kissed walking over a passionate affective way.
Besides, there are two thing of importance. First, you have written about a girl. I think that to know about those levels of passion is not good for a girl, whatever are the sexual connotations. I know this well, because my father works attending kids that have sexual traumes. If you are just a boy and she is just a girl, just kiss her cheeck or her lips, not her neck. Live with her the plenty of the innocence that has a courtship of a boy towards a girl.
Secondly, I am a “later catholic”. I know very little about the catholic legislation. So don’t trust me so much. I am most a patrol catholic who lives at the boundaries. I am like someone who tries to beacome a hero. I know about many wonderful things but I am also near to many disaster. So I can understand you. To kiss a neck is not a sin but it has many connotations that we cannot be able to fight against, whatever we think. And about to kiss a girl’s neck, I have written you that it is harmful at your age.
I have said you that I understand you. I have loveling dilemmas too. I have fell in love with a jewish girl. I could have become a hero if I have heard God, but walking on my own way has shown me just death. I died, but at least I was pursuiting something rewarding. You can be near to death because you are planning to do something riskful, and you must to think, it is my triomphy something so rewarding? I am not you, but I think it is not.
thanks for letting me know I really appreciate it